Feeding device for rock drills



Patented May 17, 1932 UNITED STATES PATENT was CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY GITY, NEW JERSEY, A CORPORATION OF NEW JERSEY FEEDING DEVICEIOR- ROCK DRILLS Application filed January 31, 1929. Serial No. 336,359.

of Figure 1 taken on the line 22 looking in the direction indicated by the arrows.

Referring more particularly to the drawings, 4 designates a rock drill of the usual construction mounted on a rock drill shell or cradle 6. The rock drill 4 is slidably secured by means of arms 8 mounted in the guiding grooves 10 of the shell 6. The shell 6 is substantially of standard construction'having the usual conical projection 12 for mounting the shell on a quarry bar (not'shown). A fluid pressure cylinder 14 is disposed within the cradle 6 and a piston 16 is reciprocably mounted therein. A piston rod 18 is attached to the piston 16 and extends th rough the rearward end 20 of the cylinder 14. Packing means 22 prevents leakage of pressure fluid from the cylinder.

A two-way throttle valve casing 24 is secured by any suitable means to the shell 6. Pressure fluid conduits 26 and 28 extend from the throttle valve casing 24 to the rear and front ends of the cylinder 14 respectively. The front end of the cylinder 14 is closed by a plate 30 secured in place by means of bolts 32. An arm 34 projects from the rearward end of the shell 6, whereby it is supported, and a pulley sheave 36 is rotatably mounted on the extreme rearward end of the arm 34. A second pulley sheave 38 is mounted on the front end of the shell 6. A flexible cable 40 is attached to the rear or free end of the piston rod 18 and passes rearwardly over the pulley 36 thence forwardly to the rock drill 4 where it is secured by means of a bolted clamp 42 to the rock drill. The cable then passes over the pulley sheave 38' and rearwardly to the piston rod 18 where it is secured to a projection 44.

The operation of the feeding device is as follows: Assuming the rock drill. to be in the positionin Figure 1, pressure fluid enters the valve casing 24 through the conduit 46 and passes out of the valve'casing through the conduit 28 to the forward end of the feeding cylinder 14. The pressure fluid forces the piston 16 rearwardly placing tension on that part of the cable designated by 40. The tension is transmitted to the rock drill through the clamp 42 and the rock drill is advanced toward the rock surface being drilled. The advance of the rock drill iscontinued until the drill hole (not sh own) reaches the desired depth or until it is necessary to change the drill steel 48. When the operator finds it necessary to retract the drill from the work for any purpose, the throttle valve 50 is turned so as to cut-ofi the supply of pressure fluid from the front end of the cylinder 14 and to admit pressure fluid through the conduit 26 to the rearward end of the cylinder 14. The pres sure fluid admitted to the rearward end of the cylinder 14 acts on the rearward face of the piston 16 and draws the cable 40 over the pulley sheave 36 thus drawing the rock drill rearwardly. a

It will be readily seen that the operator has at his disposal a simple, durable and rapidly acting means for moving the rock drill to and from the work, and thus the objects herecylinder to advance and retract the piston, and flexible means attached fixedly to both the rock drill and to the projecting end of the piston rod to transmit the movement of the piston to the rock vdrill for advancing and retracting the rock drill.

2. In a feeding device for rock drills, the combination of a rock drill, a rock drill shell slidably carrying the rock drill, a cylinder mounted in the shell, a piston in the cylinder, an arm extending'from the rock drill shell, a pulley sheave mounted on the arm, a piston rod having one end connected to the piston. and the other-end projecting through the cylinder, means. for selectively introducing I pressure fluid into opposite ends of the cylinder to advance and retract the piston, and flexible means attached fixedly to both the rock drill and to the projecting end of the piston rod and passing over the pulley sheave tof'transmit the movement of the piston to the rock drill for advancing and retracting the rock drill.

3.7In a feeding device for rock drills, the combination of a rock drill, a rock drill shell slidably carrying the rock drill, .a cylinder mounted in the shell, a piston in the cylinder, a piston rod having one end connected to the piston and the other end projecting through the cylinder, an arm extending rearwardly from the rock drill shell and supported thereby, a pulley sheave mounted on the rearward end of said arm, a second pulley sheave mounted on therock drill shell, flexible means attached fixedly to both the rock 7 drill and the projecting end of the piston rod 7 for transmitting the movement of the piston to the rock drill, the flexible means passing over the pulley sheaves, and means for selectively introducing pressure fluid into oppo site ends of the cylinder to advance and retract the piston and the piston rod for advancin g and retracting the rock drill through V the medium of the flexible means.

4. In a feeding device forrock drills, the

combination ofa rock drill, a rock drill shell .slidably carrying the rock drill, a cylinder mounted on the shell, a piston in the cylinder, a piston rod having, one end connected to rock drill for the cable, said cable passing forwardly from the securing means to the second pulley sheave thence rearwardly to i the projection on the piston rod, means for introducing pressure fluid into the front end of the cylinder to move the piston rearwardly and thereby place a tension on that part of thecable passing rearwardly fromthe sec- 0nd pulley sheave to the projection vto advancethe rock drill relatively to the shell.'

5. In a feeding device for rock drills, the combination of a rock drill, a rock drill shell slidably carrying the rock drill, a cylinder mounted on the shell, a piston in the cylinder, a piston rod having one end connected to the piston and the other end projecting through the cylinder, an arm extending rear- Wardly from the rock drill shell and support ed thereby, a pulley sheave mounted on the rearward end of said arm, a second pulley sheave mounted on the rock drill shell, a projection on the projecting end of the piston rod, a flexible cable fixedly attached to the projection, said cable passing rearwardly from the projecting end of thefpiston rod over the first pulley sheave thence forwardly to the rock drill, securing means on the rock drill for the cable, said cable passing forwardly from the securing means to the second pulley sheave thence rearwardly to the projection on the piston rod, a two-Way throttle valve secured to the shell, a pressure fluid conduit leading fr'omthe valve for introducing pressure fluid into the front end of the cylinder to move the piston rearwardly and thereby place a tension on that part of the cable passing rearwardly from the second pulley sheave to the projection to advance the rock drill relatively to the shell, and a second pressure fluid conduit leading from the valve for introducing pressure fluid into the rear end of the cylinder to movethe piston forwardly and thereby place a tension on that part of the cable passing rearwardly from the projecting end of the piston rod to the first pulley to retract the rock drill relatively to the shell.

testimony whereof I have signed this specification. V

CHARLES C. HANSEN. V 

